Ink.



UNITED sTA'rEs PATENT OFFICE.

EMILE F. KRAPF, F PITTSBURGH, PENNSYLVANIA, ASSIGNOR. TO JOSEPH M. FLANNERY, OF PITTSBURGH, PENNSYLVANIA.

Patented May 26, 1914.

INK.

1,097,981. Specification of Letters Patent. I

No Drawing.

Application filed August 15, 1912. Serial No. 715,181.

To all whom it may concern:

Be it known that I, EMILE F. KRAPF, a resident of Pittsburgh, in the county of Allegheny. and State of Pennsylvania, have invented certain new and useful Improvements in Ink; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in ink and particularly to printers ink.

The object of the invention is to provide an ink which shall be luminous and which can be used with type or plates for printing, in luminous letters or characters capable of being read in the dark, such articles as signs, watch, clock and indicator dials, labels or other devices that can be printed upon.

With this object in view, the invention consists in a composition of matter constituting ink as hereinafter set forth and pointed out in the claims.

In making my improved ink, I impregnate therein radio-active materials, such as salts of radium, actinium, ionium, mesotho rium and certain salts of uranium or polonium. v

I intimately mix approximately fifty parts of a radio-receptive material such as, colloidal sulfids of zinc, barium, calcium or strontium, or artificial Willemite, or calcium tungstate with approximately forty parts of a radio-active material such as radium barium sulfate, radium barium carbonate or the radio-active salts of radium, actinium, ionium, mesothorium, or certain salts of uranium or polonium. These substances are gradually triturated, and suitable coloring matter added. The powder thus made is thoroughly mixed with a liquid composition of burnt oil, such as linseed oil, but preferably hempseed oil or treated Chinese wood oil. The oil will be first heated until the vapors begin to burn and after it has been cooled, the resin and soap will be added in suitable quantity. Or I may make an ink containing either the colloidal precipitates of the sulfids of nickel and cobalt or the colloidal sulfids of iron, manganese disulfid, or tri-tungsten sulfid or chromium sulfid, or vanadium sulfid, worked up in an ink grinding machine w1th burnt hempseed oil or treated Chinese wood oil, resin and soap.

The purpose of impregnation of these inks with radio-active materials is to so saturate them that after drying the compounds will be in stable equilibrium. When the powdered radio-receptive and radio-active materials have been thoroughly mixed with the liquid compound, a printers ink will be formed which can be used in any wellknown printing press for printing luminous letters, figures, numerals or characters on objects 'of various kinds, and regardless of the material of which said objects are made. For instance, luminous signs may be printed upon cardboard, or the characters of watch clock or indicator dials may be printed and be capable of being read in the dark.

My improved ink is capable of use for printing upon any object or device on which it may be desired to produce luminous characters.

The proportions hereinbefore stated of the radio-receptive and radio-active materials may be varied somewhat without departing from the spirit of my invention, and other materials having similar properties might be substituted for those hereinbefore stated.

I am also aware that certain salts of iron have been used in the preparation of inks, but in this case I am selecting the use of the sulfids of the various metals precipitated in a colloidal state for the purpose of increasing and intensifying their radio-receptivity. The colloidal form of radio-receptive material is an important feature of this invention.

Having fully described my invention what I claim as new and desire to secure by Letters Patent, is:

1. A luminous ink containing colloidal material impregnated with radio-active properties.

2. A luminous ink containing radio-active material and metallic sulfids in a colloidal state.

3. Ink consisting of radio-receptive material in colloidal state impregnated with a radio-active substance, and a liquid vehicle.

4. Luminous printers ink containing radio-receptive material in colloidal state and radio-active material and mixed with a liquid body containing burnt oil and resin.

5. Luminous printers ink containing radio-receptive material in colloidal state and radio-active material mixed impregnated coloring matter, and a liquid body contain- 10' with a liquid body containing treated oil, ing oil, resin, soayfi I resin and soap. In testimony w ereof, I have si'gned this- 6. Luminous printers ink COIltaiIling raspecification in the presence of two sub- 5 dio-receptive material in colloidal state and scribing Witnesses.

radio-active material, a liquid body containa y EMILE F. KRAPF. ing burnt oil, resin and coloring matter. Witnesses:

7 Luminous printers ink containing col- R. S. FERGUSEN, loidal zinc, sulfid, barium radium sulfate. S. S. NOTTINGHAM. 

